<div class="layui-collapse" lay-filter="test">
    <form class="layui-form" action="" id="layui-search-form" lay-filter="layui-search-form" style="border:none;">
    <button id="search-btn" class="layui-icon layui-icon-search" lay-filter="btn-search" lay-submit=""></button>
    <div class="layui-colla-item">
        <h2 class="layui-colla-title">搜索<i class="layui-icon layui-colla-icon"></i></h2>
        <div id="layui-colla-content" class="layui-colla-content">

        </div>
        
    </div>
    </form>
</div>